The letters were sent 10 to 40 letters at a time from the Dallas area. He was ordered by Dallas federal court to be held in custody until a detention hearing on Aug. 4, being charged in a criminal complaint with false information and hoaxes. “ While it was determined that the mailings did not contain toxins or poisons, each incident required a field screening of the letter’s contents, which cost taxpayer dollars and diverted first responder resources,” the FBI said in a statement. It’s not clear at this moment why Hong Minh Truong did this strange activity. His attorney did not immediately reacted. The investigators began to suspect him in 2013. Truong faces up to five years in federal prison and a $250,000 fine.